How are chemical equations balanced?

Answer 1

Chemical equations are balanced with respect to (i) mass, and (ii) charge.

A constant mass of reactant (10, 20, 30 g) yields a constant mass of product (10, 20, 30 g). Every chemical reaction has mass conservation (see this old answer), and occasionally we can balance mass and charge in a systematic and methodical way by writing redox reactions.

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Answer 2

Axel Alvarado

The balance of chemical equations is achieved by balancing the coefficients in front of the chemical formulas so that the number of atoms of each element is the same on both sides of the equation.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.